Revert "Rename Check/Submit button for Stanford branch"

This reverts commit e32c27af.

common/lib/xmodule/xmodule/capa_base.py

@@ -395,8 +395,8 @@ class CapaMixin(CapaFields):
         # The logic flow is a little odd so that _('xxx') strings can be found for
         # translation while also running _() just once for each string.
         _ = self.runtime.service(self, "i18n").ugettext
-        check = _('Submit')
-        final_check = _('Final Submit')
+        check = _('Check')
+        final_check = _('Final Check')
 
         # Apply customizations if present
         if 'custom_check' in self.text_customization: